JP5230869B2 - Moving amount detection system for power transmission cables in manholes - Google Patents

Description

  The present invention relates to a movement amount detection system capable of detecting a movement amount of a power transmission cable laid in a manhole.

  Usually, in underground transmission lines, manholes (underground boxes) are installed in the ground at predetermined intervals, and transmission cables are laid in pipe lines connecting the manholes. In the manhole, the operator pulls in, pulls out or connects the power transmission cable. The power transmission cable is started up in the pit from the ground at a power transmission end or a power reception end, and is connected to an electric device via a support insulator.

  The power transmission cable laid on the underground power transmission line repeats expansion and contraction in a load change and a temperature change due to a season, and reciprocates in the power transmission line. In addition, a so-called surf riding phenomenon occurs in which the power transmission cable moves due to vibration caused by traveling of the vehicle on the ground. If the amount of movement of the power transmission cable is small, there is no particular problem, but if the amount of movement is large, the connection portion of the power transmission cable may be pulled and a connection failure may occur. Therefore, it is necessary to detect the movement of the transmission cable in the underground transmission line.

  As the movement detection device for the power transmission cable, a sensor having a contact at the lower portion of the sensor body is provided in one place in the manhole, and when the power transmission cable is moved, the detected plate attached to the cable is in contact with the sensor. There has been proposed a device that is pressed by a child to turn on a sensor and electrically detects the presence or absence of movement of a power transmission cable.

Moreover, what was disclosed by patent document 1 is proposed as a moving amount monitoring apparatus of long axis bodies, such as a power transmission cable. This movement amount monitoring device is configured to mechanically detect the movement of the long shaft body.
JP 2007-151282 A

  However, the device that electrically detects the presence or absence of movement of the power transmission cable provided with a sensor in one place in the manhole is only one sensor. There was a problem that it could not be detected.

  In addition, since the movement amount monitoring device for the long shaft disclosed in Patent Document 1 is configured to mechanically detect the movement amount, the detection result cannot be confirmed unless an operator enters the manhole. There was a problem.

  The present invention solves the above-mentioned problems in the prior art, and can detect the amount of movement of the power transmission cable, and can detect the amount of movement of the power transmission cable without an operator entering the manhole. The object is to provide a system for detecting the amount of movement of a transmission cable in a manhole that can be confirmed.

In order to solve the above problem, the invention according to claim 1 is a movement amount for detecting a movement amount of the transmission cable by detecting a movement of the detected object attached to the transmission cable laid in the manhole. In the detection system, a plurality of contact-type sensors are arranged at predetermined positions in a manhole, and when the power transmission cable is moved in the longitudinal direction, the detected object sequentially contacts the contacts of the plurality of sensors. The detection information from each sensor is stored in the storage medium of the monitoring device arranged in the manhole, and the movement amount is detected from the monitoring device to the information display device on the ground side. configuring information to transmit as a radio signal, the sensors are accommodated in one housing, the housing is its in the direction perpendicular to the longitudinal direction and the longitudinal direction of the transmission cable And summarized in that it mounted adjustably, respectively position.

  According to a second aspect of the present invention, in the first aspect, the contact of each sensor is disposed at a plurality of locations at predetermined intervals in the longitudinal direction of the power transmission cable, and the detected object is a power transmission cable. The gist is to be mounted so as to correspond to the respective contacts at a predetermined position and to be positioned on the same circumference in the circumferential direction of the power transmission cable.

In order to solve the above problem, the invention according to claim 3 detects the movement amount of the power transmission cable by detecting the movement of the detected object attached to the power transmission cable laid in the manhole by the sensor. In the movement amount detection system, a plurality of contact-type sensors are arranged at predetermined positions in a manhole, and when the power transmission cable is moved in the longitudinal direction, the detected object is sequentially applied to the contacts of the plurality of sensors. The detection information from each sensor is stored in the storage medium of the monitoring device arranged in the manhole, and the amount of movement from the monitoring device to the information display device on the ground side the detection information configured to transmit a radio signal relating to said sensor so as to be positioned on the same plane perpendicular to the longitudinal direction of the power transmission cable, and at predetermined intervals Sanga The first to third elongated holes penetrating the contacts of the first to third sensors are formed at three locations and in the longitudinal direction of the power transmission cable. The gist of the invention is that the contact is brought into contact with the end of each elongated hole and the moving direction and the moving amount of the power transmission cable are detected.

The gist of a fourth aspect of the present invention is that, in the third aspect, an adjusting plate for adjusting a dimension in a longitudinal direction of each long hole is attached to each of the long holes .

(Function)
According to the present invention, a plurality of contact-type sensors are arranged at predetermined positions in a manhole, and when the power transmission cable is moved in the longitudinal direction, the detected object sequentially contacts the contacts of the plurality of sensors. Configured to be. For this reason, the movement amount of the power transmission cable is detected by each sensor arrangement pitch. In addition, information on the amount of movement of the power transmission cable detected by each sensor is sent from the sensor body to the monitoring device via a signal line, and is transmitted from the monitoring device to the information display device on the ground side as a radio signal. .

  According to the present invention, the amount of movement of the power transmission cable can be detected, and the detection result of the amount of movement of the power transmission cable can be confirmed without an operator entering the manhole.

Hereinafter, a first embodiment of a movement amount detection system for a power transmission cable in a manhole embodying the present invention will be described with reference to FIGS.
First, a schematic configuration of the movement amount detection system of this embodiment will be described based on FIG. Three power transmission cables 12 are laid inside a manhole 11 arranged underground. A movement amount detection device 13 for individually detecting the movement amount of each power transmission cable 12 is mounted inside the manhole 11. A monitoring device 14 that monitors the movement amount of the power transmission cable 12 based on a detection signal from the movement amount detection device 13 is attached to the pit 11 a of the manhole 11. A trunk frame 15 is fitted into the upper portion of the pit 11a, and an outer lid 16 is attached to the upper portion of the trunk frame 15 so as to be opened and closed. An activation sensor 17 for activating the monitoring device 14 is attached to the body frame 15. The patrol vehicle 19 on the ground unit 18 side is provided with an information display device 20 that displays the amount of movement of the power transmission cable 12 based on the radio signal output from the monitoring device 14.
(Movement detection device 13)
Since the movement amount detection device 13 that detects the movement amount of each power transmission cable 12 is configured in the same manner, the movement amount detection device 13 of one power transmission cable 12 will be described.

  As shown in FIG. 2, a fixed mounting plate 22 is horizontally supported at a predetermined position by a clamp fitting 23 at an upper end portion of a support column 21 erected inside the manhole 11. The fixed mounting plate 22 is formed with two upper and lower position adjusting holes 22a in the horizontal direction and parallel to each other. The front surface of the fixed mounting plate 22 is in contact with a movable mounting plate 24 having two left and right position adjustment holes 24a parallel to each other. The movable mounting plate 24 can be adjusted in the horizontal direction and the vertical direction with respect to the fixed mounting plate 22 by a bolt 25 penetrating the position adjusting hole 22a and the position adjusting hole 24a and a nut 26 screwed into the bolt 25. It is connected. A housing 27 is attached to the lower front surface of the movable mounting plate 24 by brackets 28 and bolts 29. The housing 27 has housing holes 27a formed at three locations so as to be parallel to each other and vertically oriented, and each of the housing holes 27a accommodates contact-type first to third sensors 30A to 30C. ing. Since each sensor 30A-30C is the same structure, the 1st sensor 30A is demonstrated based on FIG.

  As shown in FIG. 3, a flange 27b is integrally formed on the inner peripheral surface of the lower end of the housing hole 27a of the housing 27, and the lower end edge of the covered cylindrical housing case 31 constituting the first sensor 30A is the flange. Locked to the portion 27b. A sensor body 33 is supported inside the housing case 31 via a seal member 32 made of a vibration-proof material such as a vibration-proof rubber. A needle-shaped first contact 34 </ b> A is connected to the lower end portion of the sensor body 33 so as to be directed downward and to protrude downward from the lower surface of the housing 27. The signal line 35 connected to the upper end of the sensor body 33 is led out through a through hole 31b provided in the center of the lid 31a of the housing case 31. A synthetic resin filler 36 is accommodated between the upper surfaces of the seal member 32 and the sensor body 33 and the upper inner surface of the accommodation case 31. A connecting portion between the sensor body 33 and the signal line 35 is sealed by a seal member (not shown).

  As shown in FIG. 3, air having a predetermined height in the vertical direction is formed between the lower end opening edge 31 c of the storage case 31, the lower surface of the seal member 32, and the lower inner peripheral surface of the storage case 31. A chamber R is formed. Even when water enters the manhole 11 by the air chamber R and the first sensor 30A is submerged, the water main body R is prevented from entering and the sensor main body 33 is prevented from submerging. Like to do.

As shown in FIG. 2, a clamp ring 41 formed so as to be able to expand in diameter by an elastically deformable material is fitted to the outer peripheral surface of the power transmission cable 12, and a connecting plate portion 41a formed integrally with the lower end portion thereof. Are connected by a bolt 42 and a nut 43. A detection plate 44 as a detection body is attached to the upper outer peripheral surface of the clamp ring 41. A connecting plate portion 44 a is integrally bent at the lower end portion of the detection plate 44 and connected to the clamp ring 41 by a bolt 45. A pusher plate 44b is integrally formed at the upper end of the detected plate 44 so as to correspond to the first contact 34A of the first sensor 30A. The pushing plate 44b is adapted to correspond to the second contact 34B of the second sensor 30B and the third contact 34C of the third sensor 30C.
(Monitoring device 14)
As shown in FIG. 5, the monitoring device 14 includes a sensor information detection unit 51 and a sensor information detection unit 51 that detect sensor information from the first to third sensors 30A to 30C and various other sensors (not shown). A control unit 52 having a storage medium for storing detected various sensor information is provided. The monitoring device 14 includes a data transmission unit 53 for transmitting various sensor information as radio signals from the control unit 52 to the information display device 20 when there is a request for information transmission from the information display device 20 on the ground unit 18 side. I have. The monitoring device 14 includes an activation sensor detection unit 54, and when an activation signal is transmitted by the activation sensor detection unit 54, the control unit 52 and the data transmission unit 53 are activated to move from the movement amount detection device 13. The sensor information is detected. The monitoring device 14 includes a battery 55 that drives each unit.
(Startup sensor 17)
The activation sensor 17 has a function of activating the monitoring device 14, and detects vibration information of the metal outer lid 16 by an acceleration sensor which is a kind of vibration sensor, for example. In addition, a magnetic sensor that detects a magnetic change on the outer lid 16, an ultrasonic sensor that detects ultrasonic waves on the outer lid 16, and the like can be used.
(Information display device 20)
As shown in FIG. 6, the information display device 20 displays a data receiving unit 61 that receives various sensor information transmitted as a radio signal from the data transmission unit 53 of the monitoring device 14, and displays the various sensor information. It is comprised by the display parts 62, such as a notebook type personal computer.
(Operation)
Next, the operation of the power transmission cable movement detection device in the manhole configured as described above will be described.

  The activation sensor detection unit 54 of the monitoring device 14 shown in FIG. 5 is always operated by the battery 55, and the sensor information detection unit 51, the control unit 52, and the data transmission unit 53 are in a dormant state. Yes.

  When acquiring information on the amount of movement of the power transmission cable 12 in the manhole 11 shown in FIG. 4, the upper surface of the metallic outer lid 16 is hit with a hammer or the like by a maintenance worker on the ground portion 18. The vibration information by the hammer is detected by the acceleration sensor activation sensor 17 and the activation sensor detection unit 54 of the monitoring device 14 arranged on the lower surface side of the outer lid 16. When vibration information by the hammer is detected by the activation sensor detection unit 54, the control unit 52 in a pause state shown in FIG. 5 is activated. The activated sensor information detection unit 51 is activated by the activated control unit 52, and the power transmission cable 12 is transmitted by the first to third sensors 30 </ b> A to 30 </ b> C of the movement amount detection device 13 installed corresponding to the power transmission cable 12. The position of the detected plate 44 attached to the terminal, that is, the amount of movement of the power transmission cable 12 is detected. A specific operation for detecting the amount of movement will be described below with reference to FIG.

  FIG. 1A shows an initial setting state in which the detection plate 44 of the power transmission cable 12 is separated from the first to third contacts 34A to 34C to the right by a predetermined distance (for example, 20 mm). In this state, when the power transmission cable 12 has been moved to the left by a predetermined distance (for example, 20 mm) due to the wave riding phenomenon described in the background art, the first contact 34A is displaced by the push plate 44b of the detection plate 44. Thus, the first sensor 30A is in an on state. If the power transmission cable 12 has been moved to the left from the initial state by a predetermined distance (for example, 30 mm), as shown in FIG. 1C, the first contact 34A and the second sensor of the first sensor 30A. Both 30B 2nd contactors 34B are in an ON state. Further, when the power transmission cable 12 has been moved to the left from the initial state by a predetermined distance (for example, 40 mm), the first to third contacts 34A to 34C of the first to third sensors 30A to 30C are all turned on. It is in a state.

  As described above, the state of the detected plate 44 in FIGS. 1A to 1D is transmitted to the sensor information detecting unit 51 of the monitoring device 14 via the signal line 35. And the control part 52 of the monitoring apparatus 14 starts the data transmission part 53 in hibernation, and transmits the movement amount information of the acquired power transmission cable 12 to the data receiving part 61 of the information display apparatus 20 of the ground part 18 as a radio signal. To do. The display unit 62 of the information display device 20 displays which of the detection plates 44 of the power transmission cable 12 is located in FIGS. As shown in FIG. 1B, the display unit 62 displays that the power transmission cable 12 is moved by a distance causing a problem in one direction when only the first sensor 30A is on. The In addition, as shown in FIG. 1C, when both the first sensor 30A and the second sensor 30B are in the on state, the movement amount of the power transmission cable 12 from the initial state may be a predetermined amount (for example, 30 mm). Is displayed. Furthermore, when both the first to third sensors 30A to 30C are turned on, it is displayed that the amount of movement of the power transmission cable 12 from the initial state is a predetermined amount (for example, 40 mm).

  When the detection operation of the movement amount of the power transmission cable 12 is completed, the sensor information detection unit 51, the control unit 52, and the data transmission unit 53 are shifted from the activated state to the hibernation state, and are prepared for the next periodic inspection.

According to the movement detection system of the power transmission cable in the manhole of the above embodiment, the following effects can be obtained.
(1) In the first embodiment, the first to third sensors 30A to 30C are attached to the housing 27, and the detection plate 44 attached to the power transmission cable 12 is sequentially attached to the first to third contacts 34A to 34C. It was configured to allow contact. For this reason, it can be determined whether or not the power transmission cable 12 has moved, and the amount of movement can be detected. That is, with the first and second sensors 30A and 30B turned on, the power transmission cable 12 is set to a predetermined distance from the initial state, that is, the longitudinal direction of the power transmission cable 12 between the first sensor 30A and the second sensor 30B. It is possible to detect the movement by the arrangement pitch P1. Further, when all of the first to third sensors 30A to 30C are in the on state, it is detected that the power transmission cable 12 has been moved from the initial state by the arrangement pitch (P1 + P2) of the first to third sensors 30A to 30C. be able to.

  (2) In the above embodiment, as shown in FIG. 3, an air chamber R is formed between the lower end portion of the sensor body 33 accommodated in the accommodation case 31 and the lower end opening edge of the accommodation case 31, A seal member 32 is interposed between the inner peripheral surface of the housing case 31 and the outer peripheral surface of the sensor body 33. Therefore, even if water enters the manhole 11 shown in FIG. 4 and the housing case 31 shown in FIG. 1 is submerged, the water does not enter the air chamber R and the sensor main body 33 is not submerged. For this reason, the function of the sensor main body 33 is appropriately maintained, and the electric detection operation of the movement amount of the power transmission cable 12 can be appropriately performed in the submerged state of the first to third sensors 30A to 30C.

  (3) In the above embodiment, since the sensor main body 33 is attached to the inner peripheral surface of the housing case 31 via the seal member 32 made of vibration-proof rubber, external vibration is repeatedly applied to the first to third sensors 30A to 30C. Even if this acts, the vibration transmitted to the sensor body 33 is attenuated, and the durability of the sensor body 33 can be improved.

  (4) In the above embodiment, since the housing 27 is mounted so that the position of the housing 27 can be adjusted in the horizontal direction and the vertical direction, the first to third contacts so as to appropriately face the installation position of the detection plate 44 of the power transmission cable 12. The arrangement positions of the children 34A to 34C can be adjusted.

Next, a second embodiment of the cable movement amount detection system according to the present invention will be described with reference to FIGS.
In the movement amount detection system of the second embodiment, the movement amount detection device 13 is configured so that the movement direction and the movement amount can be detected even if the movement direction of the power transmission cable 12 is bidirectional.

  As shown in FIG. 7, the first to third contacts 34 </ b> A to 34 </ b> C attached to the housing 27 are attached so as to be located on the same plane orthogonal to the longitudinal direction of the power transmission cable 12.

  On the other hand, clamp rings 41 similar to the clamp ring 41 are mounted on the outer peripheral surface of the power transmission cable 12 at predetermined intervals. A mounting plate 63 is attached to both clamp rings 41 by bolts 45 in place of the detected plate 44, and a detected plate 64 is horizontally bridged and connected to both mounting plates 63 by bolts 65. In the detection plate 64, first to third elongated holes 64a, 64b, and 64c are formed in parallel with the laying direction of the power transmission cable 12 in correspondence with the first to third contacts 34A to 34C. The first long hole 64a is formed in a straight line from the longitudinal center of the detection plate 64 toward one end of the detection plate 64, and the second long hole 64b is formed from the longitudinal center of the detection plate 64. It is formed in a straight line toward both ends of the detection plate 64. Further, the third elongated hole 64c is formed in a straight line shape from the central portion of the detection plate 64 toward the other end. An adjusting plate 66 for adjusting the length of each of the long holes 64a to 64c is attached to each of the first to third long holes 64a to 64c. As shown in FIG. 8, bolts 67 penetrating through the holes of the adjusting plate 66 are respectively penetrated into the long holes 64 a to 64 c, and nuts 68 are screwed into the lower ends of the bolts 67.

Next, the operation of the movement amount detection system of the second embodiment configured as described above will be described.
In FIG. 9A, the first to third contacts 34A to 34C are inserted into the first to third elongated holes 64a to 64c of the detection plate 64, and the first contact 34A is the left end of the first elongated hole 64a. The second contact 34B is located in the longitudinal center of the second elongated hole 64b, and the third contact 34C is located near the right end of the third elongated hole 64c. It is in the initial setting state. In this state, the first to third sensors 30A to 30C are all turned off.

  In the initial state of the detected plate 64, when the power transmission cable 12 is moved to the right in FIG. 9 by a predetermined distance (for example, 20 mm), the first contact 34A is moved by the left end of the first long hole 64a. The first sensor 30A is turned on to the right, the second contact 34B is moved to the right by the adjustment plate 66 on the left side of the second elongated hole 64b, and both the first sensor 30A and the second sensor 30B are moved. It is turned on. On the contrary, when the power transmission cable 12 is moved to the left by a predetermined distance (for example, 20 mm), the third contact 34C is moved to the left by the right end of the third long hole 64c as shown in FIG. 9C. While being moved, the second contactor 34B is moved to the left by the adjustment plate 66 on the right side of the second elongated hole 64b, and both the second sensor 30B and the third sensor 30C are in the on state.

  As is apparent from the above detection operation, when the first sensor 30A and the second sensor 30B are in the on state and the third sensor 30C is in the off state, the control unit 52 of the monitoring device 14 causes the power transmission cable 12 to be It is detected that it has been moved in the direction by a predetermined distance L1, that is, a distance L1 between the second contact 34B shown in FIG. 9A and the left adjustment plate 66. When the second sensor 30B and the third sensor 30C are in the on state and the first sensor 30A is in the off state, the control unit 52 of the monitoring device 14 causes the power transmission cable 12 to move leftward by a predetermined distance L2, that is, It is detected that the second contactor 34B shown in 9 (a) has been moved by a distance L2 between the adjustment plate 66 on the right side.

As described above, in the second embodiment, the moving direction and the moving amount of the power transmission cable 12 can be detected.
In addition, you may change the said embodiment as follows.

In the embodiment, the first to third sensors 30A to 30C are provided to detect the movement amount of the power transmission cable 12, but may be provided at four or more locations.
-You may abbreviate | omit the air chamber R of the said 1st-3rd sensors 30A-30C, and may employ | adopt another structure as a waterproof structure of each sensor.

In the above embodiment, the seal member 32 is formed of vibration-proof rubber, but may be formed of resin or metal.
A sensor having a rod-shaped contact that is linearly reciprocated in the vertical direction may be used instead of the needle-shaped first to third contacts 34A to 34C. In this case, the lower end of the contact is pushed upward by the detected object having an inclined surface, the sensor body is turned on, the movement of the power transmission cable is detected, and the detected object is separated from the contact. Then, the contact is moved downward by a spring in the sensor body. As a waterproof structure of the sensor body and the rod-shaped contact, it is conceivable that a seal ring is interposed between the sensor body and the contact.

(A)-(d) is a top view explaining the detection operation of the movement amount of the power transmission cable in 1st Embodiment which actualized the movement amount detection system of the power transmission cable of this invention. The perspective view of the movement amount detection apparatus of a power transmission cable. The longitudinal cross-sectional view which shows the 1st sensor of a movement amount detection apparatus. The longitudinal cross-sectional view which shows schematic structure of the movement amount detection system provided in the manhole. The block circuit diagram of the monitoring apparatus. The block circuit diagram of an information display apparatus. The perspective view which shows the movement amount detection apparatus in 2nd Embodiment which actualized the movement amount detection system of the power transmission cable of this invention. The expanded sectional view of the principal part in 2nd Embodiment. (A)-(c) is a top view explaining the detection operation | movement of the moving amount | distance of the power transmission cable in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Manhole, 12 ... Power transmission cable, 14 ... Monitoring device, 18 ... Ground part, 20 ... Information display device, 27 ... Housing, 30A-30C ... 1st-3rd sensor, 64a-64c ... 1st-3rd length Hole, 66 ... adjusting plate.

Claims (4)

In the movement amount detection system that detects the movement amount of the transmission cable by detecting the movement of the detected object attached to the transmission cable laid in the manhole,
A plurality of contact-type sensors are arranged at predetermined positions in a manhole so that when the power transmission cable is moved in the longitudinal direction, the detected object is sequentially brought into contact with the contacts of the plurality of sensors. The detection information from each sensor is stored in the storage medium of the monitoring device disposed in the manhole, and the detection information about the movement amount is transmitted from the monitoring device to the information display device on the ground side by radio signal. configured to transmit as,
Each sensor is housed in one housing, and the housing is mounted so that its position can be adjusted in the longitudinal direction of the power transmission cable and in the direction orthogonal to the longitudinal direction, and the amount of movement of the power transmission cable in the manhole, Detection system.   2. The contact of each sensor according to claim 1, wherein the contacts of the sensors are arranged at a plurality of locations at predetermined intervals in the longitudinal direction of the power transmission cable, and the detected object corresponds to the contacts at a predetermined position of the power transmission cable. And a movement amount detection system of the power transmission cable in the manhole, which is mounted so as to be positioned on the same circumference with respect to the circumferential direction of the power transmission cable. In the movement amount detection system that detects the movement amount of the transmission cable by detecting the movement of the detected object attached to the transmission cable laid in the manhole,
A plurality of contact-type sensors are arranged at predetermined positions in a manhole so that when the power transmission cable is moved in the longitudinal direction, the detected object is sequentially brought into contact with the contacts of the plurality of sensors. The detection information from each sensor is stored in the storage medium of the monitoring device disposed in the manhole, and the detection information about the movement amount is transmitted from the monitoring device to the information display device on the ground side by radio signal. Configured to transmit as
The sensors are arranged at three locations at a predetermined interval so as to be located on the same plane perpendicular to the longitudinal direction of the power transmission cable, and each contact of the first to third sensors is placed on the detected object. First to third elongated holes penetrating the child are formed at three locations and oriented in the longitudinal direction of the power transmission cable, the contact is brought into contact with the end of each elongated hole, A system for detecting a movement amount of a power transmission cable in a manhole, wherein the movement direction and the movement amount thereof are detected.   4. The movement amount detection system for a power transmission cable in a manhole according to claim 3, wherein an adjustment plate for adjusting a longitudinal dimension of each of the long holes is attached to each of the long holes.

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